柯林斯词典silica /ˈsɪlɪkə/ 1. N-UNCOUNT Silica is silicon dioxide, a compound of silicon which is found in sand, quartz, and flint, and which is used to make glass. 二氧化矽 返回 silica剑桥词典a mineral that exists in various forms , including sand , quartz , and flint , used to make glass and cement 矽石，二氧化矽 返回 silica